Method of pressing a coupling on to a hose



Feb. 25, 1936. J. P. EASTMAN 2,031,824

METHOD OF PRESSING A COUPLING ON TO A HOSE Original FiledApril 20, 1934 ,T 7- Fig.1 9 5142 i. Fq4

Inventor Patented I Feb. 25, 1936 UNITED STATES PATENT OFFICE rm'rnon or rnnssmc. A COUPLING oN TO A HOSE Joseph Peta-Eastman, Manltowoc, Wis.

Original application April 20, 1934, Serial No. 721,517. Divided and this application August as, 1935, Serial No. 33,149

Claims.

The present invention relates to' methods of pressing a coupling on' to a hose. It is for use with that class of hose couplings known as pressed-on couplings, which, in order to make them grip the hose, are permanently contracted on to it, as distinguished from that class in which parts are screwed together to efiect the gripping.

In particular the invention provides a method which accomplishes, all in one operation, the

three following objects, namely:

(1) It contracts the coupling to grip the hose.

'(2) It places a band in position encircling the coupling, to be left there permanently, said band supplying all strength needed to resist bursting pressure, whereby it is possible to use a coupling that is split longitudinally.

(3) An inwardly protruding ring onthe inside of the sleeve of the hose is desirable for the purpose of gripping the hose the more effectively. But, if such ring existed, as an internal matter, before contraction, it would prevent insertion of the hose into the sleeve, and would, moreover,

make the sleeve less easy to bore. Under the present invention, however, such ring can be provided, originally, not as an internal but as an external, thickening .of the wall of the sleeve. The present method then converts it into an in- 5 ward protrusion.

In the draWing:

Fig. 1 is a plan, partly in section, showing a coupling ready to be contracted on to a hose according to the method which is the subject of 4 the present invention, the front half of the die being removed.

Fig. 2. is a plan showing the condition after contraction, the front half of the die' being re-' And Figs. 8 and 9 Show a modification, they being sectional, broken away, plan views, respectively before and after contraction, the hose being removed in both cases.

Refen-ing to the drawing, and describing first the preferred form, Figs. 1 to 6:' 5 Referring more particularly to Figs. 1, 3, and 5, which show the coupling before contraction: The coupling I has the end wall 2 with the sleeve 3 projecting therefrom.

Said sleeve 3 consists of the smaller bored cylin- 10 drical portion 5 nearest to said end wall, the intermediate portion 5, and the larger bored cylindrical portion 6 furthest from said end wall.

Said intermediate portion 5 is internally cylindrical and externally conical before contraction, 15 Figs. 1, 3, and 5, whereby it constitutes, in-elfect, an annular wedge, having its apex toward said end wall 2.

The internal reinforcing tube 8, usually called the "insert, visible in Fig. 6 only, is present in 0 all cases. v

The hexagonal neck 9 extending from said end wall 2 gives a grip for a wrench, and is internally threaded at It, Figl 6, to receive said insert 8. Also it has the female thread I I, Fig. 6, to receive 25 the male threaded end l2 of another coupling or of other equipment.

Internal rings M in said further cylindrical portion provide hose grippingmeans, while the coarse internal thread I 5 in said intermediate 30 portion 5 and in said nearer cylindrical portion 4 provide gripping means, while also they facilitate the insertion of the hose end.

Referring more particularly to Fig. 1. The band l6.is a length of strong metal tube. The end of the hose I1 is passed through it, and its lower half lies in the recess Hi; In the lower halfdie IS. The upper half-die 20, Fig. 7, not shown in Figs. 1 and 2, is similarly recessed, and receives the upper half of said band.

Said hose I1 is somewhat reduced in diameter at the shoulder 2|, and the hose end 22, thus reduced, is screwed with some difiiculty into said threads l5, this connection being made as tight a lit as is practicable.

Thereafter the process of contraction is as follows:-- I I The rim 23, of the bell-mouthed extreme end of said sleeve 3, is entered into the tapered ori- 5 fice 24 of the dies; and the coupling is forced into the die until the position shown in Fig. 2 is' before contraction, as shown in Fig, 1, has dis- 5 1,969,548 aforesaid, it is necessary to'reduce the girth" of a solid continuous ring of metal, which requires great pressure. The present notches obviate the need for that pressure, thereby greatly facilitating said process of contraction. Also the longwisegrooves 21 are provided,.extending along the middle of the inside faces of said tongues 26, which make it easier to bend said tongues to the sharper curves which they must assume during said contraction.

During said process of contraction, accordingly, said tongues 26 gradually approach each other until they meet along their edges in the straight line 28, Fig. 2,,closing up said notches 25. And, during said process, the whole of 'the metal of said tongues 26 adjusts itself to the new shapes required of the tongues. But this the metal does without the great pressure that would have been needed if the notches had not been made.

When the contracting has been finished as described, leaving the parts in the relative positions shown in Fig. 2, the dies can be released from the annular die-block 3|, Fig. 7. Saidl halfdies 19 and 28 can then be removed, and they will leave behind thern'said band 16 in position upon the sleeve, binding said tongues 26 tightly against the hose.

The groove 32 is provided on the inside face of said band, and the lugs 33 are provided on the outside of said sleeve. During the contraction,

as soon as said lugs register with said groove, they spring into the same, due to the outward pressure of the hose substance, and they thereby lock said hand against any possible displacement in the axial direction.

Vents 35 are provided communicating be tween the end 36 of the hose, Fig. 6, and the outer addition to said vents 35, the annular recess 3'! is .provided, chambered out in the inside wall of the sleeve, and in communication with said vents for the following purpose:-

It is found in practice that s ce, close at hand, for a portion of the hose bstanc'e displaced during contraction to escape into, is imperative, for which purpose the vents are not adequate. The present annular chamber is therefore provided. When the reduced hose end 22 is screw-ed into the threads i5 as hereinbefore described, it butts against said end wall 2, but leaves said recess 31 unfilled for the time being, see Figs. 1 and 5. But, after contraction, said recess 31 is filled, as is shown in Fig. 6; or it may be only partly filled.

Said recess 31 therefore relieves what' is, in efiect, equivalent to a fluid pressure, exerted by the substance of that portion of the hose which is imprisoned at the inward end of the coupling,

by the process of contraction. Said vents 35 are then left to carry out chiefly the following duties, namely, first, to allow air to escape while the hose end is being screwed in, before contraction; and, later, to allow any water or other fluid, which may leak back through said threads, ll] of said reinforcing tube or insert 8, to escape to the outer air, thereby preventing said leakage to the end of a hose which consists in positioning inside wall of said intermediate portion '5 of the 5 sleeve, the word further here meaning further from said end wall 2. Before contraction, as

shown in Fig. 5, said edge 38 is the beginning of the cylindrical threading l5 aforesaid which receives the end of the hose as hereinbefore described. But, after contraction, as shown in Fig. 6, said edge 38 has become the apex of an inwardly protruding annular ring biting into the substance of the hose to grip the hose.

Said inwardly protruding ring is one of the main features of the present construction, aswas a corresponding ring in my Patent No. 1,969,548 aforesaid. The curve 39, however, which terminates said intermediate wedge-shaped portion 5 at its outward or thicker end, is a curve dictated by shop considerations, to reduce liability to fracture, and does not correspond,with the cone which was provided in the corresponding location in my Patent No. 1,969,548.

As compared with said earlier construction, they present one makes it possible to locate said edge 38 further from said end wall 2, whereby'after contraction, said edge 38 protrudes more deeply inward, and is consequently more effective as a grip.

As showing more clearly the changes in shape whichare caused by the contraction, the dotted line 4 I, Fig. 6, corresponds with the line 42, Fig. 6,

' and shows the shape before contraction; while,

similarly, the dotted line 43, Fig. 6, orresponds 35 with the line 44, Fig. 5. The curv arrows 48 and 46 then show the path of the contraction.

Figs. 8 and 9 show a modification. They are views before and after contraction respectively. In this modification, the curved line 48, Fig. 8, takes the place of the straight line 42 of Fig. 5. Opposite the belly 4 9 of said curve 48 the con.- traction is therefore less than in the corresponding location in Fig. 5, whereby, after contraction, turning to Fig. 9, the inside line 56 is a curve, in contrast with theinside line 5| in Fig. 6, which is substantially straight. This construction gives added sharpness to the inwardly protruding ring 52, Fig. 9. The object in showing this modification is to show that the inward ring can be made more pronounced by suitably hollowing the outside of the annular wedge of the preferred form.

I claim:

1. The method of clamping a hose coupling on the segments of a split die around a band, the bandthen lying in a recess provided in the die: forcing'the coupling endwise into the die and into the band, thereby contracting the coupling to grip the hose, and then removing the segments of the die, leaving the band encircling the coupling.

2. The method of clamping a hose coupling having a sleeve divided into tongues at its open end on to the end of a hose, which method consists in positioning the segments of a split .die around a band, the band then lying in a recess provided in the die, forcing the sleeve endwise an end wall, on to the end of a hose, which method consists in pushing a band down over the end of a hose to a substantial distance from the end, placing the coupling over the end of the hose, positioning the segments of a split die around the band, the band then lying in a recess provided in the die, forcing the sleeve endwise, beginning at its downward end, into the die and into the band, thereby contracting the sleeve to grip the hose, and then removing the segments of the die, leaving the hand encircling the sleeve.

4. The method described in claim 1 with the 'further step that the forcing action of the die is continued until an interlocking is efiected between 5 the coupling and the band by the interengagement of a. projection upon one such part with a recess in the other.

5. The methodof clamping on to the end of a hose 2. hose-coupling which has a series of segmental gripping elements placed around the hose, which method consists in positioning the segments of a split die around a. band, the hand then lying in a recess provided in the die, forcing the coupling endwise into the die and into the band, the die having a tapered'orifice whereby it gathers the segmental elements inward, causing them to grip the hose,'a-nd then remoying the segments of the die, leaving the band encircling the said elements.

J. PETER EAS'I'MAN. 

